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authorJames Morris <jmorris@namei.org>2008-06-09 15:58:05 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-09 15:58:05 -0700
commit17e6e59f0a1d7188d783c15dc3ccebd95a0840cd (patch)
treeaabe39d205166733003dcc22b95bc77714691de1 /net/ipv6
parent560ee653b67074b805f1b661988a72a0e58811a5 (diff)
netfilter: ip6_tables: add ip6tables security table
This is a port of the IPv4 security table for IPv6. Signed-off-by: James Morris <jmorris@namei.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/netfilter/Kconfig12
-rw-r--r--net/ipv6/netfilter/Makefile1
-rw-r--r--net/ipv6/netfilter/ip6table_security.c172
3 files changed, 185 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 6cae5475737..689dec899c5 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -208,5 +208,17 @@ config IP6_NF_RAW
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
+# security table for MAC policy
+config IP6_NF_SECURITY
+ tristate "Security table"
+ depends on IP6_NF_IPTABLES
+ depends on SECURITY
+ default m if NETFILTER_ADVANCED=n
+ help
+ This option adds a `security' table to iptables, for use
+ with Mandatory Access Control (MAC) policy.
+
+ If unsure, say N.
+
endmenu
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index fbf2c14ed88..3f17c948eef 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
+obj-$(CONFIG_IP6_NF_SECURITY) += ip6table_security.o
# objects for l3 independent conntrack
nf_conntrack_ipv6-objs := nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o nf_conntrack_reasm.o
diff --git a/net/ipv6/netfilter/ip6table_security.c b/net/ipv6/netfilter/ip6table_security.c
new file mode 100644
index 00000000000..063a3d9c3c6
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_security.c
@@ -0,0 +1,172 @@
+/*
+ * "security" table for IPv6
+ *
+ * This is for use by Mandatory Access Control (MAC) security models,
+ * which need to be able to manage security policy in separate context
+ * to DAC.
+ *
+ * Based on iptable_mangle.c
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
+ * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
+MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
+
+#define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
+ (1 << NF_INET_FORWARD) | \
+ (1 << NF_INET_LOCAL_OUT)
+
+static struct
+{
+ struct ip6t_replace repl;
+ struct ip6t_standard entries[3];
+ struct ip6t_error term;
+} initial_table __initdata = {
+ .repl = {
+ .name = "security",
+ .valid_hooks = SECURITY_VALID_HOOKS,
+ .num_entries = 4,
+ .size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
+ .hook_entry = {
+ [NF_INET_LOCAL_IN] = 0,
+ [NF_INET_FORWARD] = sizeof(struct ip6t_standard),
+ [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
+ },
+ .underflow = {
+ [NF_INET_LOCAL_IN] = 0,
+ [NF_INET_FORWARD] = sizeof(struct ip6t_standard),
+ [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
+ },
+ },
+ .entries = {
+ IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
+ IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
+ IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
+ },
+ .term = IP6T_ERROR_INIT, /* ERROR */
+};
+
+static struct xt_table security_table = {
+ .name = "security",
+ .valid_hooks = SECURITY_VALID_HOOKS,
+ .lock = __RW_LOCK_UNLOCKED(security_table.lock),
+ .me = THIS_MODULE,
+ .af = AF_INET6,
+};
+
+static unsigned int
+ip6t_local_in_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ return ip6t_do_table(skb, hook, in, out,
+ init_net.ipv6.ip6table_security);
+}
+
+static unsigned int
+ip6t_forward_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ return ip6t_do_table(skb, hook, in, out,
+ init_net.ipv6.ip6table_security);
+}
+
+static unsigned int
+ip6t_local_out_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ /* TBD: handle short packets via raw socket */
+ return ip6t_do_table(skb, hook, in, out,
+ init_net.ipv6.ip6table_security);
+}
+
+static struct nf_hook_ops ip6t_ops[] __read_mostly = {
+ {
+ .hook = ip6t_local_in_hook,
+ .owner = THIS_MODULE,
+ .pf = PF_INET6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP6_PRI_SECURITY,
+ },
+ {
+ .hook = ip6t_forward_hook,
+ .owner = THIS_MODULE,
+ .pf = PF_INET6,
+ .hooknum = NF_INET_FORWARD,
+ .priority = NF_IP6_PRI_SECURITY,
+ },
+ {
+ .hook = ip6t_local_out_hook,
+ .owner = THIS_MODULE,
+ .pf = PF_INET6,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP6_PRI_SECURITY,
+ },
+};
+
+static int __net_init ip6table_security_net_init(struct net *net)
+{
+ net->ipv6.ip6table_security =
+ ip6t_register_table(net, &security_table, &initial_table.repl);
+
+ if (IS_ERR(net->ipv6.ip6table_security))
+ return PTR_ERR(net->ipv6.ip6table_security);
+
+ return 0;
+}
+
+static void __net_exit ip6table_security_net_exit(struct net *net)
+{
+ ip6t_unregister_table(net->ipv6.ip6table_security);
+}
+
+static struct pernet_operations ip6table_security_net_ops = {
+ .init = ip6table_security_net_init,
+ .exit = ip6table_security_net_exit,
+};
+
+static int __init ip6table_security_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&ip6table_security_net_ops);
+ if (ret < 0)
+ return ret;
+
+ ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
+ if (ret < 0)
+ goto cleanup_table;
+
+ return ret;
+
+cleanup_table:
+ unregister_pernet_subsys(&ip6table_security_net_ops);
+ return ret;
+}
+
+static void __exit ip6table_security_fini(void)
+{
+ nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
+ unregister_pernet_subsys(&ip6table_security_net_ops);
+}
+
+module_init(ip6table_security_init);
+module_exit(ip6table_security_fini);